Product Quality Supervision and Testing Institute of Panzhihua

Dadukou, China

Product Quality Supervision and Testing Institute of Panzhihua

Dadukou, China
SEARCH FILTERS
Time filter
Source Type

Dan J.,National Center for Quality Supervision and Inspection of Vanadium and Titanium Products | Dan J.,Product Quality Supervision and Testing Institute of Panzhihua | Chen X.-Y.,National Center for Quality Supervision and Inspection of Vanadium and Titanium Products | Chen X.-Y.,Product Quality Supervision and Testing Institute of Panzhihua | And 4 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2016

With the increasing inspection requirements on content of trace impurity elements, a simultaneous determination method of oxygen, nitrogen and hydrogen in vanadium-nitrogen alloy was developed. 0.050 g of sample after treatment was packed with clean nickel foil and put into nickel basket, which was then put into degassed high temperature graphite crucible. The analytical power was controlled at 4.5 kW. The content of oxygen, nitrogen and hydrogen in vanadium-nitrogen alloy materials was simultaneously determined by pulse heating-time of flight mass spectrometry using 12C+, 14N+ and 2H+ as the analytical line, respectively. The experimental results showed that the linear correlation coefficients of calibration curves under optimal conditions were higher than 0.999.The detection limit of oxygen, nitrogen and hydrogen in proposed method was 0.02, 0.06 and 0.002 μg/g, respectively. The proposed method was applied to the determination of oxygen (6.5-94.3 μg), nitrogen (12-264 μg) and hydrogen (0.10-8.8 μg) in vanadium-nitrogen alloy samples. The determination results were basically consistent with those obtained by pulse heating-infrared thermal conductivity detection method (IR/TCD). The relative standard deviations (RSD, n=7) of oxygen and nitrogen were less than 9%, while the standard deviation (SD, n=7) of hydrogen was not higher than 0.000 5%. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.


Liu L.,Product Quality Supervision and Testing Institute of Panzhihua | Gong H.-L.,Product Quality Supervision and Testing Institute of Panzhihua | Zhong L.,Product Quality Supervision and Testing Institute of Panzhihua | Wang Y.,Product Quality Supervision and Testing Institute of Panzhihua
Yejin Fenxi/Metallurgical Analysis | Year: 2017

The titanium sponge sample was dissolved with hydrofluoric acid by ultrasonic. The low-valence titanium was oxidized by adding nitric acid. The excessive fluorine ions were complexed with boric acid. The stability of silver chloride colloid was improved through ultrasonic with glycerol as dispersant. The solution was diluted with nitric acid (1+19) and determined at 420 nm. Thus, a determination method of chlorine in titanium sponge by silver nitrate turbidimetry was established. The results indicated that about 1 g of sample could be digested completely with 20 mL of hydrofluoric acid(1+5) by ultrasonic at 80 kHz for 5 min. 30 mL of nitric acid (1+19), 2.5 mL of glycerol and 3.0 mL of silver nitrate solution were added into certain volume of sample solution. After dilution to the mark with nitric acid (1+19), the solution was shaken up by ultrasonic for 40 s, kept in darkness for 10 min and followed by determination. The results indicated that the mass concentration of chlorine ions in range of 0.05-2.4 μg/mL showed linear relationship with its corresponding absorbance. The linear correlation coefficient was 0.999 7. The detection limit of chlorine was 0.05 μg/mL. The content of chlorine in two titanium sponge samples was determined according to the experimental method. The results were basically consistent with those obtained by national standard method GB/T 4698.25-1996. The relative standard deviation (RSD, n=11) was less than 5%. The recoveries were between 96% and 103%. © 2017, CISRI Boyuan Publishing Co., Ltd. All right reserved.


Wang Y.,Product Quality Supervision and Testing Institute of Panzhihua | Chen X.-Y.,Product Quality Supervision and Testing Institute of Panzhihua | Liu L.,Product Quality Supervision and Testing Institute of Panzhihua
Yejin Fenxi/Metallurgical Analysis | Year: 2017

Blast furnace slag containing vanadium and titanium has low reaction activity and the sample is hardly dissolved. The blast furnace slag containing vanadium and titanium was dissolved with sulfuric acid-nitric acid-hydrofluoric acid system (volume ratio of 1∶2.5∶1) by heating at 90-100℃. The solution acidity was adjusted to 1.0 mol/L with hydrochloric acid in order to avoid the hydrolysis of titanium ion. Potassium chloride was added to inhibit the ionization of titanium at high temperature. Consequently, a determination method of titanium dioxide in blast furnace slag containing vanadium and titanium was established by nitrous oxide-acetylene flame atomic absorption spectrometry. The dissolution and determination condition was optimized. The results showed that Lambert-Beer's law was obeyed for mass concentration of titanium in range of 4-30 μg/mL. The linear correlation coefficient was 0.999 1. The detection limit was 1.7 mg/g. The proposed method was applied to the determination of titanium dioxide in certified reference material and actual sample of blast furnace slag containing vanadium and titanium. The results were consistent with the certified values. The relative standard deviations (RSD, n=5) were less than 0.4%. © 2017, CISRI Boyuan Publishing Co., Ltd. All right reserved.


Wang Y.,Product Quality Supervision and Testing Institute of Panzhihua | Zhong L.,Product Quality Supervision and Testing Institute of Panzhihua | Yang T.,Product Quality Supervision and Testing Institute of Panzhihua | Shi Z.-Y.,Product Quality Supervision and Testing Institute of Panzhihua
Yejin Fenxi/Metallurgical Analysis | Year: 2016

Since the resonance line of P (178 nm) is in ultraviolet vacuum region, it is difficult to directly determine P by flame atomic absorption spectrometry. However, P could generate a series of PO diatomic molecule absorption spectra in acetylene/air flame with proper proportion, so P could be quantitatively analyzed by continuum source atomic absorption spectrometry. After the sample was fully dissolved with nitric acid and hydrochloric acid by heating, a determination method of P in ferrovanadium by high resolution continuum source atomic absorption spectrometry was established in air-acetylene flame with proper proportion using PO 327.04 nm as analytical line. The optimal working parameters of high resolution continuum source atomic absorption spectrometer were obtained: the flow ratio of acetylene to air was 0.16; the height of combustion head was 12 mm; the integral pixel was 9 pixl. The results showed that the mass concentration of P in range of 5.0-80 mg/L had good linearity to the absorbance. The linear equation was y=0.000 8 x+0.001 9 with correlation coefficient of r=0.999 5. The detection limit of method was 1.0 mg/L. The interference test of coexisting elements in sample indicated that the matrix elements including V and Fe had no interference. Ca and Mg in the sample had interference with the determination. However, Al in sample could react with Ca and Mg to form stable CaAl2O4 and MgAl2O4 compounds, thus eliminating the interference. The proposed method was applied to the determination of P in certified reference material and actual sample of ferrovanadium. The results were basically consistent with the certified values. The relative standard deviations (RSD, n=11) were between 1.9% and 4.4%. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.


Wang Y.,Product Quality Supervision and Testing Institute of Panzhihua | Wang W.,Product Quality Supervision and Testing Institute of Panzhihua | Liu Y.-Q.,Product Quality Supervision and Testing Institute of Panzhihua | Liu L.,Product Quality Supervision and Testing Institute of Panzhihua | Gong H.-L.,Product Quality Supervision and Testing Institute of Panzhihua
Yejin Fenxi/Metallurgical Analysis | Year: 2016

For the detection of arsenic in titanium dioxide, the sample was usually dissolved with nitric acid-hydrochloric acid-hydrofluoric acid system. However, this pretreatment method had the following problems: the titanium was easily hydrolyzed; the digestion time was relatively long. In the experiment, the dissolution method of titanium dioxide sample with sulfuric acid-ammonium sulfate system was proposed. The problems above were solved. Moreover, the reaction was mild. Accordingly, the determination method of arsenic in titanium dioxide by hydride generation atomic fluorescence spectroscopy (HG-AFS) was established. The results showed that the mass concentration of arsenic in range of 0.50-20 μg/L had good linear relationship with the corresponding absorbance. The linear correlation coefficient was 0.9998. The detection limit of method was 0.05 μg/L. The interference test results indicated that the coexisting elements in matrix titanium sample did not interfere with the determination. The proposed method was applied to the analysis of actual sample, and the found results were consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). The relative standard deviation (RSD, n=11) was less than 5%. The recoveries of standard addition were between 95% and 101%. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.


Zhai K.-X.,Product Quality Supervision and Testing Institute of Panzhihua | Wang Y.,Product Quality Supervision and Testing Institute of Panzhihua | Liu Y.-Q.,Product Quality Supervision and Testing Institute of Panzhihua | Liu L.,Product Quality Supervision and Testing Institute of Panzhihua
Yejin Fenxi/Metallurgical Analysis | Year: 2015

A method for simultaneous determination of oxygen, nitrogen and hydrogen in titanium alloy was established by inert gas fusion-thermal conductivity/infrared method. The calibration curve was plotted by use of appropriate standard samples of titanium alloy. Through testing, the optimal test condictions was determined: the amount of fluxing agent nickel basket was 1 g for 0.13-0.15 g of sample and the analysis power was 0.55 kW. The linear ranges of oxygen, nitrogen and hydrogen were 0.000 1%-0.1%, 0.000 1%-0.01% and 0.000 05%-0.002% (mass fraction), and their detection limits were 0.000 045%, 0.000 061% and 0.000 018% (mass fraction), respectively. The experimental method has been applied to the determination of oxygen, nitrogen and hydrogen in practical titanium alloy, whose results were consistent with those of national standard method (GB/T4698.7-2011 and GB/T4698.15-2011), with relative standard deviation (RSD, n=6) within the range of 0.14 %-4.6 %. ©, 2015, Central Iron and Steel Research Institute. All right reserved.


Dan J.,Product Quality Supervision and Testing Institute of Panzhihua | Liu Y.-Q.,Product Quality Supervision and Testing Institute of Panzhihua | Chen X.-Y.,Product Quality Supervision and Testing Institute of Panzhihua | Li Z.-J.,Product Quality Supervision and Testing Institute of Panzhihua | Liu L.,Product Quality Supervision and Testing Institute of Panzhihua
Yejin Fenxi/Metallurgical Analysis | Year: 2015

The sample was prepared by the fusion method. The mixed flux (mLi2B4O7:mLiBO2=67:33) was used to prepare the sample tablet in platinum-gold crucible. The ammonium nitrate was added as the oxidizing agent to avoid the loss of arsenic in fusion process. The results showed that the optimal conditions were as follows: the dilution ratio was 1: 13|, and the melting temperature was 950℃. The high-purity reagent of vanadium pentoxide was used as matrix. The certified reference material was added to prepare the fusion tablet for the drawing of calibration curves of vanadium pentoxide, iron, phosphorus, silicon, arsenic, potassium oxide and sodium oxide as major and minor components. The determination method of major and minor components in vanadium pentoxide by X-ray fluorescence spectrometry (XRF) was established. The results indicated that the detection limit of minor components including iron, phosphorus, silicon, arsenic, potassium oxide and sodium oxide was 200, 100, 100, 100, 100 and 100 μg/g, respectively. The relative standard deviations (RSD) were less than 0.2%. The actual vanadium pentoxide sample was analyzed, and the found results were in good agreement with those obtained by the industrial standard method at present. ©, 2015, Central Iron and Steel Research Institute. All right reserved.

Loading Product Quality Supervision and Testing Institute of Panzhihua collaborators
Loading Product Quality Supervision and Testing Institute of Panzhihua collaborators